Re: ntg-context Digest, Vol 11, Issue 29

[Otared Kavian <otared@wanadoo.fr>]

At 10:48 -0700 14/05/05, Fei He wrote:
>Hi all,
>
>I have a math equation question too. This has made me pulling my hair
>off, for a while. Please see below:
>(snip)
>
>
>
>                                     ~~ this & never seems to give
>me the alignment that I need.
>>      }
>  > \stopformula
>

Hi,

I think the point is to use a \cr after each line of aligned text in \cases.
On my installation the following works fine:

\usemodule[amsl]
\starttext

\startformula
      {\bf f(x)} =
      \cases{
        \sum_{x=1}^n x      &\quad if I am false \cr
        \displaystyle % just to see the difference
        \sum_{x=1}^n x^2    &\quad \text{if I am true} \cr
      }
\stopformula

\stoptext

Note that I added a \quad  after each "&" in order to have a little 
more space: however this is not essential.

Best regards: OK